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Full Freeview on the Hemel Hempstead (Hertfordshire, England) transmitter

first published this on - UK Free TV
sa_gmapsGoogle mapsa_bingBing mapsa_gearthGoogle Earthsa_gps51.729,-0.426 or 51°43'43"N 0°25'34"Wsa_postcodeHP3 8SA

 

The symbol shows the location of the Hemel Hempstead (Hertfordshire, England) transmitter which serves 74,000 homes. The bright green areas shown where the signal from this transmitter is strong, dark green areas are poorer signals. Those parts shown in yellow may have interference on the same frequency from other masts.

This transmitter has no current reported problems

The BBC and Digital UK report there are no faults or engineering work on the Hemel Hempstead (Hertfordshire, England) transmitter.

Choose from three options: ■ List by multiplex ■ List by channel number ■ List by channel name
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Which Freeview channels does the Hemel Hempstead transmitter broadcast?

If you have any kind of Freeview fault, follow this Freeview reset procedure first.

Digital television services are broadcast on a multiplexes (or Mux) where many stations occupy a single broadcast frequency, as shown below.

MuxH/VFrequencyHeightModeWatts
PSB1
BBCA
 V max
C40 (626.0MHz)214mDTG-32,000W
Channel icons
1 BBC One (SD) London, 2 BBC Two England, 9 BBC Four, 23 BBC Three, 201 CBBC, 202 CBeebies, 231 BBC News, 232 BBC Parliament, 250 BBC Red Button, plus 15 others

PSB2
D3+4
 V max
C43 (650.0MHz)214mDTG-32,000W
Channel icons
3 ITV (SD) (London), 4 Channel 4 (SD) London ads, 5 Channel 5, 6 ITV 2, 10 ITV3, 13 E4, 14 Film4, 15 Channel 4 +1 London ads, 18 More4, 26 ITV4, 30 E4 +1, 35 ITV +1 (London),

PSB3
BBCB
 V max
C46 (674.0MHz)214mDTG-62,000W
Channel icons
56 5SELECT, 101 BBC One HD (England no regional news), 102 BBC Two HD (England), 103 ITV HD (ITV London), 104 Channel 4 HD London ads, 105 Channel 5 HD, 106 BBC Four HD, 109 BBC Three HD, 204 CBBC HD, 205 CBeebies HD, plus 1 others

COM4
SDN
 V max
C37 (602.0MHz)214mDTG-82,000W
Channel icons
12 Quest, 20 Drama, 21 5USA, 29 ITV2 +1, 32 5STAR, 33 5Action, 41 Legend, 42 GREAT! movies action, 46 Channel 5 +1, 58 ITVBe +1, 59 ITV3 +1, 64 Blaze, 67 CBS Reality, 74 Dave ja vu, 78 TCC, 81 Blaze +1, 89 ITV4 +1, 203 CITV, 208 Pop Player, 211 Ketchup TV, 212 YAAAS!, plus 15 others

COM5
ArqA
 V max
C31 (554.0MHz)230mDTG-82,000W
Channel icons
11 Sky Arts, 17 Really, 19 Dave, 31 E4 Extra, 36 pick, 40 Quest Red, 43 Food Network, 47 Film4 +1, 48 Challenge, 49 4seven, 57 Smithsonian Channel, 60 Drama +1, 70 Quest +1, 75 Yesterday +1, 83 Together TV, 233 Sky News, plus 9 others

COM6
ArqB
 V max
C29 (538.0MHz)230mDTG-82,000W
Channel icons
 FreeSports, 25 W, 27 Yesterday, 34 GREAT! movies, 39 DMAX, 44 HGTV, 71 Quest Red +1, 73 HobbyMaker, 82 Talking Pictures TV, 84 PBS America, 91 Classic Hits, 235 Aljazeera English, plus 18 others

DTG-3 64QAM 8K 2/3 24.1Mb/s DVB-T MPEG2
DTG-6 256QAM 32KE 2/3 40.2Mb/s DVB-T2 MPEG4
DTG-8 64QAM 8K 3/4 27.1Mb/s DVB-T MPEG2
H/V: aerial position (horizontal or vertical)

Are you trying to watch these 0 Freeview HD channels?


The Hemel Hempstead (Hertfordshire, England) mast is not one of the extended Freeview HD (COM7 and COM8) transmitters, it does not provide these high definition (HD) channels: .

If you want to watch these HD channels, either use Freesat HD, or move your TV aerial must point to one of the 30 Full Freeview HD transmitters. For more information see the want to know which transmitters will carry extra Freeview HD? page.

Which BBC and ITV regional news can I watch from the Hemel Hempstead transmitter?

regional news image
BBC London 4.9m homes 18.4%
from London W1A 1AA, 30km southeast (138°)
to BBC London region - 55 masts.
regional news image
ITV London News 4.9m homes 18.4%
from London WC1X 8XZ, 31km southeast (135°)
to ITV London region - 55 masts.

How will the Hemel Hempstead (Hertfordshire, England) transmission frequencies change over time?

1984-971997-981998-20122012-1318 Apr 2018
B E TB E TB E TE TK T
C29ArqB
C31ArqA
C34_local
C37SDN
C40BBCA
C41ITVwavesITVwavesITVwavesD3+4
C42_local
C43D3+4
C44BBC2wavesBBC2wavesBBC2wavesBBCA
C46BBCB
C47C4wavesC4wavesC4wavesBBCB
C50tv_offSDN
C51tv_offBBC1wavesBBC1wavesBBC1waves
C55tv_offArqB
C59tv_offArqA

tv_off Being removed from Freeview (for 5G use) after November 2020 / June 2022 - more
Table shows multiplexes names see this article;
green background for transmission frequencies
Notes: + and - denote 166kHz offset; aerial group are shown as A B C/D E K W T
waves denotes analogue; digital switchover was 4 Apr 12 and 18 Apr 12.

How do the old analogue and currrent digital signal levels compare?

Analogue 1-4 10kW
SDN, ARQA, ARQB, BBCA, D3+4, BBCB(-7dB) 2kW
Mux 1*, Mux 2*, Mux A*, Mux B*(-14dB) 400W
Mux C*, Mux D*(-17dB) 200W

Which companies have run the Channel 3 services in the Crystal Palace transmitter area

Sep 1955-Jul 1968Associated-Rediffusion†
Sep 1955-Jul 1968Associated TeleVision◊
Jul 1968-Dec 1992Thames†
Jul 1968-Feb 2004London Weekend Television♦
Jan 1993-Feb 2004Carlton†
Feb 2004-Dec 2014ITV plc†
Feb 2004-Dec 2014ITV plc♦
Feb 1983-Dec 1992TV-am•
Jan 1993-Sep 2010GMTV•
Sep 2010-Dec 2014ITV Daybreak•
• Breakfast ◊ Weekends ♦ Friday night and weekends † Weekdays only. Hemel Hempstead was not an original Channel 3 VHF 405-line mast: the historical information shown is the details of the company responsible for the transmitter when it began transmitting Channel 3.

Comments
Monday, 13 May 2013
D
Denis Turton
11:58 AM
Hemel Hempstead

Hi, many thanks for your reply-my post code is HP3 0AJ. Tuned to channels 44,55 & 59-signal strength 55 to 60% but no indication of signal quality.

Kindest regards,

Denis Turton.

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Denis Turton's 2 posts GB
Thursday, 5 December 2013
J
jim
7:32 PM

is the signal from Hemel Hempstead (Hertfordshire horisontal or vertical?

if this is stated above I could not findit.

link to this comment
jim's 1 post GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

7:53 PM

jim: Alongside each multiplex, on the green bar, it says "vertical".

link to this comment
Dave Lindsay's 5,724 posts GB
M
Michael
sentiment_satisfiedGold

7:53 PM

jim: It's vertical, beneath the column heading "aerial position" above.

link to this comment
Michael's 358 posts GB
Wednesday, 11 December 2013
T
trevor montgomery
9:10 PM
Bushey

Question:- Is there a future intention to add BBC4 HD and BBC HD news to the Hemel Hempstead transmitter. At reception location WD232AQ Crystal Place is unreliable in bad weather conditions/refraction angle, Sandy and Hannington are even less HD reliable and don't carry local london news and that's all using a 27m mast, 20db forward gain aerial and 1.7db nf mast preamp. Satellite signal is no problem but video bandwidth/picture quality is less than freeview plus it very messy to switch from freeview to freesat just for two channels.

link to this comment
trevor montgomery's 1 post GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

9:23 PM

trevor montgomery: No, not in the foreseeable future at least.

The new Sandy Heath HD mux will be co-channel with that of Hannington, so even if you used it you might find it wiped out at times. The power of the new mux from Crystal Palace is 36.3kW as against 200kW for the other six channels.

link to this comment
Dave Lindsay's 5,724 posts GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

9:36 PM

trevor montgomery: Have you fitted aircraft warning lights on your aerial?

If you can receive the new multiplex (C33) from Crystal Palace then you could diplex your Hemel Hempstead aerial with it so as to use Hemel Hempstead for all viewing except the new HD mux.

link to this comment
Dave Lindsay's 5,724 posts GB
Dave Lindsay
sentiment_very_satisfiedPlatinum

9:57 PM

trevor montgomery: As you may be aware the cause of your difficulty with reception from Crystal Palace is the high ground at Bushey Heath and Stanmore Common, which is heavily tree-laden.

With this in mind, the use of a high-gain aerial is probably best not advised as it means that the "beam" width you're receiving across is narrower - it's that narrow angle which you're relying on for good quality. A lower gain aerial would provide a wider acceptance angle and therefore "poor" quality over a narrow part of its acceptance angle wouldn't deminish the quality of the signal coming down the lead as much (of course that isn't to say that it will be good enough).

The point is that with digital you have strength and quality. You can make the signal stronger by amplifying it but quality starts at the aerial.

I write these comments as a technical bod rather than an aerial installer. I have, however, taken this knowledge from one of the experts on here and it makes perfect sense.

link to this comment
Dave Lindsay's 5,724 posts GB
Thursday, 26 December 2013
G
gtibb
12:29 PM
Hemel Hempstead

The only chance of getting all the BBC HD channels from Hemel (or indeed any Freeview transmitter) is if standard DVB is dropped in favour of DVB-T2. That would allow all the BBC HD channels to fit in the BBC A mux.

If the 700Mhz band is taken for 5G mobile in a few years, this will have to happen anyway.

link to this comment
gtibb's 14 posts GB
K
KMJ,Derby
sentiment_satisfiedGold

1:59 PM

gtibb: There is only room for five HD channels on a single DVB-T2 multiplex at present, so even allowing for BBC Parliament remaining in SD (which would seem sensible as a cost saver) the capacity would have to increase somewhat to fit in 10 radio stations plus red button HD alongside all the other BBC HD channels. It will be interesting to see if PSB3 continues to carry BBC1&2 HD plus ITVHD and Channel 4HD. This would actually be more sensible as there would then be one multiplex for regional content, allowing PSB1 to be a national service on fewer frequencies than at present, also only one multiplex (PSB3) would then need to be transmitted from regional correction stations. It is possible, however, that only the COM muxes will switch to DVB-T2 in 2018 since if the level of DVB-only equipment remains too high at that time Ofcom is likely to require PSB1 and PSB2 to continue in SD as at present until some later date in order to maintain a service to viewers with older equipment.

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KMJ,Derby's 1,811 posts GB
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